Screw tip rotating jig

Abstract

To provide a screw tip rotating jig capable of improving workability when attaching and detaching a screw tip.SOLUTION: A screw tip rotating jig 80 includes: a bracket 81 attached to an end part 11 of a heating barrel 10; a bearing shaft 87 that is disposed on the bracket 81 at a position below an axis AX of the screw 20 protruding from the end part 11 of the heating barrel 10 and extends in a direction along the axis AX of the screw 20; and a bearing 88 that is supported by the bearing shaft 87 and rotatably supports a screw tip 26 attached to an end part 22 of the screw 20.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a screw tip rotating jig, and more particularly to a screw tip rotating jig used for attaching and detaching a screw tip to a screw of an injection molding machine. [Background technology]

[0002] The screw tip attached to the tip of the screw of an injection molding machine is often screwed into the screw with a large tightening torque, so that it may be difficult for an operator to attach and detach the screw tip to and from the screw using a tool such as a wrench. For this reason, a jig for attaching and detaching the screw tip to and from the screw has been proposed. For example, in the screw tip attachment and detachment device described in Patent Document 1, an engagement member engaged with the screw tip is rotated using a lever with a bolt screwed into a cylinder head mounting bolt hole at the tip of the heating barrel as a fulcrum, thereby suppressing bending of the screw tip and adhesion between the screw and the screw tip when attaching and detaching the screw tip. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 9-57802 Summary of the Invention [Problem to be solved by the invention]

[0004] Here, in a large injection molding machine, the diameter of the screw is large, so the screw tip attached to the screw is also relatively large. Since a large screw tip is heavy, a large force is also required to support the screw tip when attaching and detaching the screw tip to the screw. When attaching and detaching a relatively large screw tip, the screw tip needs to be supported with such a large force, which tends to deteriorate the workability when attaching and detaching the screw tip, so there is room for improvement in terms of efficiently attaching and detaching the screw tip.

[0005] The present invention has been made in consideration of the above, and has an object to provide a screw tip rotation jig that can improve the workability when attaching and detaching a screw tip. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems and achieve the object, the screw tip rotation jig of the present invention comprises a bracket attached to the end of a heated barrel, a bearing shaft that is positioned on the bracket at a position lower than the axis of the screw protruding from the end of the heated barrel and extends in a direction along the axis of the screw, and a bearing that is supported by the bearing shaft and rotatably supports the screw tip attached to the end of the screw. Effect of the Invention

[0007] The screw tip rotation jig according to the present invention has the effect of improving the workability when attaching and detaching the screw tip. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a schematic diagram showing a configuration example of an injection molding machine in which a screw tip rotating jig according to the first embodiment is used. [Diagram 2] FIG. 2 is a perspective view of the injection device shown in FIG. [Diagram 3] FIG. 3 is a detailed view of the heating barrel shown in FIG. [Figure 4] FIG. 4 is a view taken along the line AA in FIG. [Diagram 5] FIG. 5 is a perspective view showing a state in which a screw tip rotating jig is attached to a heating barrel. [Figure 6] FIG. 6 is an explanatory diagram showing the positional relationship between the bearing and the screw tip. [Figure 7] FIG. 7 is a front view of the bracket shown in FIG. [Figure 8] FIG. 8 is a perspective view of a wrench used to attach and detach the screw tip. [Figure 9] FIG. 9 is a perspective view showing a state in which the screw tip rotating jig according to the second embodiment is attached to a heating barrel. [Figure 10] FIG. 10 is a perspective view of the bracket shown in FIG. [Figure 11] FIG. 11 is an explanatory diagram showing a state in which an auxiliary support member is attached to a side of the bracket different from that shown in FIG. [Figure 12] FIG. 12 is an explanatory diagram showing a modified example of the screw tip rotating jig according to the first embodiment, in which a different diameter bearing is arranged on a bearing shaft. [Figure 13] FIG. 13 is an explanatory diagram showing a modified example of the screw tip rotating jig according to the second embodiment, in which a different diameter auxiliary bearing is arranged on the auxiliary bearing shaft. [Figure 14] FIG. 14 is an explanatory diagram of a modified example of the screw tip rotating jig according to the second embodiment, which has an auxiliary support member capable of adjusting the position of the auxiliary bearing. [Figure 15] 15 is a perspective view of a support member included in the auxiliary support member shown in FIG. [Figure 16] 16 is a perspective view of a mounting member provided on the auxiliary support member shown in FIG. 14. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of a screw tip rotation jig according to the present disclosure will be described in detail with reference to the drawings. Note that the present invention is not limited to this embodiment. In addition, the components in the following embodiments include those that are replaceable and easily conceivable by a person skilled in the art, or those that are substantially the same.

[0010] [Embodiment 1] FIG. 1 is a schematic diagram showing a configuration example of an injection molding machine 1 in which a screw tip rotating jig 80 according to the first embodiment is used. FIG. 2 is a perspective view of the injection device 5 shown in FIG. 1. In FIG. 2, a cross section of the heating barrel 10 is illustrated. In addition, in the following description, the up-down direction in the normal use state of the injection molding machine 1 is described as the up-down direction Z in the injection molding machine 1, the upper side in the normal use state of the injection molding machine 1 is described as the upper side in the injection molding machine 1, and the lower side in the normal use state of the injection molding machine 1 is described as the lower side in the injection molding machine 1. In addition, in the following description, the longitudinal direction Y of the injection molding machine 1 is also described as the longitudinal direction Y in each part having the injection molding machine 1, and the direction perpendicular to both the up-down direction Z and the longitudinal direction Y of the injection molding machine 1 is described as the width direction X in the injection molding machine 1.

[0011] <Injection molding machine 1> The injection molding machine 1 according to the first embodiment has an injection unit 5 and a clamping unit 60, which are mounted on a frame (not shown) of the injection molding machine 1. The injection molding machine 1 melts a resin material into a plasticized material in the injection unit 5, and cools and solidifies the plasticized material injected from the injection unit 5 by the clamping unit 60, thereby making it possible to manufacture various desired molded products. The injection molding machine 1 according to the first embodiment is a hydraulic injection molding machine 1 whose main operation is performed by hydraulic pressure.

[0012] <Injection device 5> In the following description, the side where the mold clamping device 60 is located relative to the injection device 5 in the longitudinal direction Y is referred to as the front or front side, and the side opposite the side where the mold clamping device 60 is located relative to the injection device 5 in the longitudinal direction Y is referred to as the rear or rear side.

[0013] The injection device 5 includes a heating barrel 10 and a screw 20. The heating barrel 10 is capable of heating and melting the resin material inside to turn it into a plasticized material. The heating barrel 10 is also equipped with a nozzle 14 for injecting the plasticized material at one end in the longitudinal direction Y, and the other end is connected to a hopper 16 for feeding the raw material. More specifically, the nozzle 14 is provided on an end cap 13 (see FIG. 3) attached to the front end of the heating barrel 10. The hopper 16 is connected to the inside of the heating barrel 10, and is capable of feeding pellets (not shown), which are granular resin material, to the heating barrel 10. This allows the raw resin to be fed from the hopper 16 into the heating barrel 10.

[0014] The heating barrel 10 is formed in a substantially cylindrical shape, is disposed so that its axial direction is oriented along the longitudinal direction Y, and is provided with a heater (not shown) such as a band heater. This allows the heating barrel 10 to melt the resin material inside. That is, the heating barrel 10 can increase the temperature of the heating barrel 10 by the heater, and the resin material supplied from the hopper 16 can be heated and melted inside to turn it into a molten resin, which is a plasticized material.

[0015] The screw 20 is disposed inside the heating barrel 10 and has a helical shape whose axial direction is along the axial direction of the heating barrel 10, that is, the screw 20 has a helical groove on the outer circumferential surface. Thus, the screw 20 formed with a helical shape is rotatable around the axial center in the heating barrel 10. In addition, the screw 20 is movable in the axial direction of the rotation in the heating barrel 10. In other words, the screw 20 is disposed in the heating barrel 10 so that the central axis of the cylinder, which is the shape of the heating barrel 10, and the rotation axis of the screw 20 are approximately aligned, and the screw 20 is disposed so as to be movable in the axial direction of the heating barrel 10. The screw 20 rotatably disposed in the heating barrel 10 is capable of kneading the molten resin by rotating inside the heating barrel 10, and therefore the heating barrel 10 is a barrel capable of kneading the molten resin inside.

[0016] A hydraulic motor 35 is connected via a rotating member 31 to the end of the screw 20 opposite to the side where the nozzle 14 is located in the longitudinal direction Y. The rotating member 31 is rotatably supported by a holder 32 via a radial bearing 33 and a thrust bearing 34, and constitutes a bearing unit 30 together with the holder 32.

[0017] The hydraulic motor 35 is connected to a hydraulic pump 55 via a two-position changeover valve 50, and the hydraulic pump 55 is connected to a tank 56. The hydraulic motor 35 is rotated by pressure oil supplied from the hydraulic pump 55, and is capable of rotating the rotating member 31. The hydraulic motor 35 rotates the rotating member 31, thereby rotating the screw 20 in the heating barrel 10, and is thereby capable of introducing the resin material from the hopper 16 into the heating barrel 10.

[0018] The injection device 5 also has a pair of hydraulic cylinders 40 that can move the bearing unit 30 in the longitudinal direction Y, i.e., in the axial direction of the screw 20. The hydraulic cylinder 40 has a piston 41 that can move in the longitudinal direction Y, and one end of a piston rod 42 is connected to the piston 41. The other end of the piston rod 42 is connected to the bearing unit 30, and the hydraulic cylinder 40 can move the bearing unit 30 in the longitudinal direction Y by moving the piston 41 in the longitudinal direction Y.

[0019] The inside of the hydraulic cylinder 40 that moves the bearing unit 30 is divided into two side chambers 45, 46 by the piston 41. Each of the side chambers 45, 46 is connected to a three-position selector valve 51 via an oil pipe, and the three-position selector valve 51 is connected to a hydraulic pump 55 via a two-position selector valve 54.

[0020] The three-position switching valve 51 is capable of operating the hydraulic cylinder 40 by supplying pressure oil to the side chambers 45, 46 in the hydraulic cylinder 40. In detail, when the solenoid 52 on the right side in FIG. 1 is excited, the three-position switching valve 51 is in a state where the pressure oil discharged from the hydraulic pump 55 is supplied to the injection side chamber 46 of the hydraulic cylinder 40 and the return side chamber 45 is opened to the tank 56. When the solenoid 53 on the left side in FIG. 1 is excited, the three-position switching valve 51 is in a state where the pressure oil discharged from the hydraulic pump 55 is supplied to the return side chamber 45 of the hydraulic cylinder 40 and the injection side chamber 46 is opened to the tank 56.

[0021] When the two solenoids 52, 53 are not excited, the three-position selector valve 51 communicates with the two side chambers 45, 46 of the hydraulic cylinder 40 and opens to the tank 56. The two-position selector valve 54 can switch between supplying and not supplying the pressure oil discharged from the hydraulic pump 55 to the three-position selector valve 51.

[0022] The pair of hydraulic cylinders 40, which operate in response to pressure oil supplied from the three-position switching valve 51, move the bearing unit 30 in the longitudinal direction Y, thereby making it possible to move the screw 20 in the longitudinal direction Y within the heating barrel 10. Furthermore, the pair of hydraulic cylinders 40 can extrude the resin material from the nozzle 14 by moving the screw 20 toward the side where the nozzle 14 is located, while the molten resin material is stored in the portion on the end side where the nozzle 14 is located within the heating barrel 10. This allows the resin material molten within the heating barrel 10 to be injected from the nozzle 14.

[0023] The injection device 5 configured as above is movable in the longitudinal direction Y by a propulsion mechanism (not shown). Therefore, by moving in the longitudinal direction Y, the injection device 5 is capable of bringing the nozzle 14 into contact with or away from the mold 65 of the mold clamping device 60.

[0024] <Mold clamping device 60> The mold clamping unit 60 has a fixed platen 61, a movable platen 62, and a mold 65. The fixed platen 61 is disposed on a frame (not shown) and fixed to the frame, and the movable platen 62 is disposed on the frame on the opposite side to the side where the injection unit 5 is located with respect to the fixed platen 61, and is disposed so as to be freely movable with respect to the fixed platen 61.

[0025] The mold 65 has a cavity 65a filled with the resin material injected from the nozzle 14 of the heating barrel 10 of the injection device 5, and the resin material can be molded in the cavity 65a. The mold 65 for molding the resin material in this manner has a fixed mold 66 and a movable mold 67. The fixed mold 66 is attached to the surface of the fixed platen 61 on the side where the movable platen 62 is located, and the movable mold 67 is attached to the surface of the movable platen 62 on the side where the fixed platen 61 is located. The movable mold 67 attached to the movable platen 62 faces the fixed mold 66 attached to the fixed platen 61, and when the movable platen 62 approaches the fixed platen 61, it approaches the fixed mold 66 and is combined with the fixed mold 66.

[0026] The mold clamping device 60 has a hydraulic cylinder (not shown) for moving the movable platen 62 in the longitudinal direction Y. The mold clamping device 60 is capable of moving the movable platen 62 relative to the fixed platen 61 by operating the hydraulic cylinder, and by moving the movable platen 62 relative to the fixed platen 61, it is possible to close the movable die 67 and the fixed die 66 or to open the movable die 67 and the fixed die 66.

[0027] <Heated Barrel 10> FIG. 3 is a detailed view of the heating barrel 10 shown in FIG. 1. FIG. 4 is a view taken along the line AA in FIG. 3. As shown in FIG. 3, the heating barrel 10 is formed in a substantially cylindrical shape, and the nozzle 14 disposed at the front end in the longitudinal direction Y is formed in a substantially cylindrical shape with an inner diameter smaller than the inner diameter of the heating barrel 10, and is disposed to open to the front side in the longitudinal direction Y. In detail, an end cap 13 is attached to the front end in the longitudinal direction Y of the heating barrel 10, and the nozzle 14 is provided on the end cap 13. The end cap 13 is attached to the heating barrel 10 by a plurality of mounting bolts 15. That is, a plurality of screw holes 12 are formed in the end 11 on the front side in the longitudinal direction Y of the heating barrel 10, and the end cap 13 is attached to the end 11 of the heating barrel 10 by screwing the mounting bolts 15 into the screw holes 12 of the heating barrel 10 while being positioned at the end 11 of the heating barrel 10.

[0028] The screw 20 disposed within the heating barrel 10 has a flight 21 that protrudes outward in the radial direction of the screw 20 and is formed in a spiral shape centered on the axis AX of the screw 20. As a result, the screw 20 has a spiral groove-like portion between adjacent revolution portions of the flight 21 that is formed in a spiral shape.

[0029] The screw 20 thus formed has a screw tip 26 disposed at its front end in the longitudinal direction Y. The screw tip 26 has a tip portion 28 on the front end side, and the diameter of the tip portion 28 is larger than the diameter of a portion of the screw tip 26 located rearward of the tip portion 28. The outer diameter of the portion of the screw tip 26 located rearward of the tip portion 28 is smaller than the outer diameter of the screw 20. In addition, the tip portion 28 of the screw tip 26 is formed in a shape on the front end side such that the diameter becomes smaller toward the front side in the longitudinal direction Y, and the shape protrudes toward the front side.

[0030] In addition, the portion of the tip 28 of the screw tip 26 near the rear end is formed in a polygonal shape so that the outer peripheral surface when viewed in the direction of the axis AX of the screw 20 can be engaged with a tool used to attach and remove the screw tip 26 from the screw 20 to rotate the screw tip 26.

[0031] The screw tip 26 is attached to the screw 20 by being screwed into a threaded hole 23 formed in the screw 20. More specifically, the screw 20 has a threaded hole 23 formed in a front end 22 in the longitudinal direction Y, and the screw tip 26 is provided with a threaded portion 27 extending toward the rear side in the longitudinal direction Y. The screw tip 26 is attached to the screw 20 by screwing the threaded portion 27 into the threaded hole 23 formed in the end 22 of the screw 20. By attaching the screw tip 26 formed in a shape that protrudes toward the front side to the front end of the screw 20, the resin material molten in the heating barrel 10 can be efficiently injected from the nozzle 14 having a small diameter.

[0032] A ring 24 and a spacer 25 are disposed on a screw tip 26 attached to the screw 20. The spacer 25 is formed in a disk shape with a hole formed in the center, and has an outer diameter that is slightly larger than the outer diameter of the screw 20. The screw tip 26 is attached to the screw 20 by threading a threaded portion 27 into the screw hole 23 of the screw 20 with the threaded portion 27 passing through the center hole of the spacer 25.

[0033] The ring 24 is formed in a substantially cylindrical shape, with an inner diameter larger than the outer diameter of the portion between the tip 28 and the threaded portion 27 of the screw tip 26, and an outer diameter formed to be approximately the same as the inner diameter of the heating barrel 10. Therefore, a gap is formed between the inner surface of the ring 24 and the outer surface of the screw tip 26. The length of most of the ring 24 in the axial direction is shorter than the length of the portion between the tip 28 and the threaded portion 27 of the screw tip 26. Therefore, the ring 24 is capable of moving in the longitudinal direction Y between the spacer 25 through which the threaded portion 27 of the screw tip 26 is passed and the tip 28 of the screw tip 26.

[0034] The ring 24 has a protrusion 24a protruding toward the tip 28 at the end on the side where the tip 28 is located, and the protrusions 24a are arranged at multiple locations in the circumferential direction of the ring 24. A groove 28a is formed in the tip 28 of the screw tip 26 at a position corresponding to the portion in the circumferential direction where the protrusion 24a of the ring 24 is arranged. The groove 28a is formed to communicate between the side of the tip 28 where the ring 24 is arranged and the front portion of the tip 28.

[0035] <Action of injection molding machine 1> The injection molding machine 1 according to the first embodiment includes the above-mentioned configuration, and its operation will be described below. The injection molding machine 1 performs one injection and molding operation as one cycle, and repeatedly executes this cycle of injection and molding operations. Each cycle includes a plurality of processes for injecting molding material and molding a product. Each cycle includes, for example, a mold closing process, a filling process, a pressure holding process, a mold opening process, and a removal process.

[0036] The mold closing process is a process in which the movable platen 62 of the mold clamping device 60 is moved in a direction approaching the fixed platen 61, thereby combining the movable mold 67 and the fixed mold 66 and forming a cavity 65a corresponding to the product shape between the movable mold 67 and the fixed mold 66.

[0037] The filling process is a process in which the molten resin, which is a resin material melted by the heated barrel 10 of the injection unit 5, is injected into the cavity 65a formed by the movable mold 67 and the fixed mold 66 attached to the mold clamping unit 60. Specifically, in the filling process, the two-position switching valve 54 and the three-position switching valve 51 shown in FIG. 1 are switched so that the pressure oil from the hydraulic pump 55 enters the injection side chamber 46 of the hydraulic cylinder 40, and the oil in the return side chamber 45 returns to the tank 56. As a result, the piston 41 of the hydraulic cylinder 40 moves to the left in FIG. 1, and the screw 20 moves to the left via the bearing unit 30. As a result, the molten resin in the heated barrel 10 is injected from the nozzle 14 into the cavity 65a of the mold 65.

[0038] When the molten resin in the heating barrel 10 is injected from the nozzle 14, the ring 24 disposed on the screw tip 26 moves rearward by moving the screw 20 forward in this manner. This causes the ring 24 to come into contact with the spacer 25, eliminating the gap between the ring 24 and the spacer 25, thereby preventing the molten resin material from flowing through the gap between the ring 24 and the spacer 25 to the rear side of the screw tip 26.

[0039] The pressure dwell process is a process of waiting while maintaining the pressure of the molding resin, which is the resin material injected into the cavity 65a formed by the movable mold 67 and fixed mold 66 attached to the mold clamping device 60, and waiting for a certain period of time until the molding resin becomes a molded product as the temperature of the molding resin drops and solidifies. Also, in the pressure dwell process, the resin material to be injected in the next cycle is sent to the end side where the nozzle 14 of the heating barrel 10 of the injection device 5 is located, and the resin material to be used in the next cycle is prepared. The resin material is also measured during the pressure dwell process.

[0040] 1, the hydraulic motor 35 is rotated by the pressure oil discharged from the hydraulic pump 55, and the screw 20 is rotated via the rotating member 31. In addition, by switching the two-position selector valve 54 and the three-position selector valve 51, the pressure oil from the hydraulic pump 55 enters the return side chamber 45 of the hydraulic cylinder 40, and the oil in the injection side chamber 46 returns to the tank 56. As a result, the piston 41 of the hydraulic cylinder 40 moves to the right in FIG. 1, and the screw 20 also moves to the right via the bearing unit 30, causing the screw 20 to retreat.

[0041] When the resin material is metered, the screw 20 is rotated and moved backward in this manner, so that the resin material supplied from the hopper 16 into the heating barrel 10 melts due to the heat generated by the heater provided in the heating barrel 10 and the frictional heat generated by the rotation of the screw 20, and remains at the tip of the heating barrel 10. That is, when the screw 20 is moved backward, the ring 24 arranged on the screw tip 26 moves forward, forming a gap between the ring 24 and the spacer 25. As a result, the molten resin material passes through the gap between the ring 24 and the spacer 25, passes through the gap between the inner surface of the ring 24 and the outer surface of the screw tip 26, and passes through the groove portion 28a formed in the tip portion 28 of the screw tip 26, and accumulates at the front side of the screw tip 26. The resin material is metered by accumulating the molten resin material in the portion in front of the screw 20 in the heating barrel 10 in this manner. After the resin material is metered, the two-position changeover valve 50 is switched to stop the hydraulic motor 35.

[0042] The mold opening process is a process in which the movable platen 62 is moved away from the fixed platen 61 and the movable mold 67 is moved away from the fixed mold 66 in order to remove the molded product formed by the fixed mold 66 and the movable mold 67 attached to the mold clamping device 60.

[0043] The removal step is a step in which, after the movable die 67 is separated from the fixed die 66, the molded product adhering to the movable die 67 is pushed out by an ejection mechanism (not shown) to remove the molded product from the die 75.

[0044] When molding a molded product with the injection molding machine 1, the cycle of these injection and molding operations is repeatedly executed to continuously mold the molded products.

[0045] <Screw tip rotation jig 80> The injection molding machine 1 which molds molded products in this way undergoes maintenance as necessary, and each part is removed to perform work such as inspection and cleaning. When performing maintenance work, for example, the screw tip 26 attached to the screw 20 is attached and detached. Here, the screw tip 26 of a large injection molding machine 1 is large in size and heavy in weight. The large and heavy screw tip 26 needs to be attached to and detached from the screw 20 while being supported with a large force, which tends to deteriorate workability.

[0046] In the first embodiment, when attaching or detaching the screw tip 26 to the screw 20, the screw tip rotating jig 80 is used, thereby ensuring workability when attaching or detaching the screw tip 26. The screw tip rotating jig 80 according to the first embodiment is applied to a relatively large injection molding machine 1 in which, for example, the clamping force of the clamping device 60 is about 350t to 3500t, the diameter of the screw 20 is about φ60mm to φ160mm, and the weight of the screw tip 26 is about 2kg to 50kg.

[0047] 5 is a perspective view showing a state in which the screw tip rotating jig 80 is attached to the heating barrel 10. The screw tip rotating jig 80 is used by being attached to the heating barrel 10 in a state in which the end cap 13 is removed from the heating barrel 10. When using the screw tip rotating jig 80, the hydraulic cylinder 40 (see FIG. 1) is operated to move the screw 20 to the front end of the movement range of the screw 20 in the longitudinal direction Y. Furthermore, the screw 20 is shifted forward with respect to the rotating member 31 (see FIG. 1) to which the rear end of the screw 20 is connected.

[0048] In detail, the screw 20 is connected to the rotating member 31 without being able to rotate relative to the rotating member 31 in the circumferential direction by engaging a key arranged on the screw 20 with a key groove formed in the rotating member 31, but the screw 20 is moved forward with respect to the rotating member 31 while maintaining a state in which a part of the key is engaged with the key groove. The screw 20 is moved forward with respect to the rotating member 31 to such an extent that, for example, about half of the key in the length direction protrudes forward from the key groove and about the remaining half of the key in the length direction is engaged with the key groove.

[0049] As a result, the screw 20 is moved forward from its relative position with respect to the heated barrel 10 when the injection molding machine 1 is in use, and is made to protrude forward from the end 11 of the heated barrel 10 from which the end cap 13 has been removed. The screw tip rotating jig 80 is attached to the end 11 of the heated barrel 10 in this state in which the end cap 13 has been removed from the heated barrel 10 and the screw 20 has been moved as far forward as possible.

[0050] The screw tip rotating jig 80 has a bracket 81, a bearing shaft 87, and a bearing 88. The bracket 81 is a base of the screw tip rotating jig 80, and is attached to the end 11 of the heating barrel 10 by a mounting bolt 86. More specifically, the bracket 81 is attached to the end 11 of the heating barrel 10 by the mounting bolt 86 that is screwed into a screw hole 12 for attaching an end cap 13 to the end 11 of the heating barrel 10. That is, the bracket 81 is attached to the end 11 of the heating barrel 10 by using the screw hole 12 for attaching the end cap 13 by the mounting bolt 15 (see FIG. 3) at the end 11 of the heating barrel 10 and screwing the mounting bolt 86 for the bracket 81 into the screw hole 12 of the heating barrel 10. The bracket 81 is attached to the end 11 of the heating barrel 10 at a position lower than the axis AX (see FIG. 3) of the screw 20.

[0051] The bearing shaft 87 is a shaft that passes through the inside of the bearing 88 and supports the bearing 88 rotatably, and is disposed on the bracket 81. More specifically, the bearing shaft 87 is disposed on the bracket 81 at a position lower than the axis AX of the screw 20 protruding from the end 11 of the heating barrel 10, and is supported by the bracket 81. In addition, when the bracket 81 is attached to the end 11 of the heating barrel 10, the bearing shaft 87 is disposed on the bracket 81 at a position lower than the axis AX of the screw 20, in a direction extending along the axis AX of the screw 20.

[0052] The bearing 88 is rotatably supported by a bearing shaft 87 disposed on the bracket 81. Since the bearing shaft 87 is disposed at a position lower than the axis AX of the screw 20 when the bracket 81 is attached to the end portion 11 of the heating barrel 10, the bearing 88 supported by the bearing shaft 87 is also disposed at a position lower than the axis AX of the screw 20.

[0053] Furthermore, the bearing 88 is capable of coming into contact with the screw tip 26 attached to the end 22 of the screw 20 or the ring 24 disposed on the screw tip 26 when the bracket 81 is attached to the end 11 of the heating barrel 10. Therefore, the bearing 88 rotatably supported by the bearing shaft 87 rotatably supports the screw tip 26 when it comes into contact with the screw tip 26 or the ring 24 attached to the end 22 of the screw 20. More specifically, since the bearing 88 is disposed at a position below the axis AX of the screw 20, the bearing 88 comes into contact with the screw tip 26 at a position below the axis AX of the screw 20 and rotatably supports the screw tip 26 from below.

[0054] 6 is an explanatory diagram showing the positional relationship between the bearing 88 and the screw tip 26. The bearing 88 supported by the bearing shaft 87 is disposed in a range in which the position in the direction along the axis AX of the screw 20, i.e., the position in the longitudinal direction Y, is located where the screw tip 26 attached to the screw 20 protruding from the end 11 of the heating barrel 10 is located. More specifically, the bearing 88 is disposed in a range in which the ring 24 disposed on the screw tip 26 is located. The position of the bearing 88 in the longitudinal direction Y is restricted by fitting it to the bearing shaft 87, or a member that restricts the movement of the bearing 88 in the longitudinal direction Y is provided on the bearing shaft 87, so that the position of the bearing 88 in the longitudinal direction Y is maintained in the range where the ring 24 disposed on the screw tip 26 is located.

[0055] Furthermore, a plurality of bearings 88 are supported on one bearing shaft 87, and a plurality of bearings 88 are arranged on one bearing shaft 87. In the first embodiment, two bearings 88 are arranged on one bearing shaft 87. The two bearings 88 arranged on one bearing shaft 87 have the same size.

[0056] Fig. 7 is a front view of the bracket 81 shown in Fig. 5. The bracket 81 has an attachment hole 82a used when attaching the screw tip rotating jig 80 to the end 11 of the heating barrel 10, a bearing shaft support portion 82b that supports the bearing shaft 87, a relief portion 82c that suppresses interference between the screw tip 26 and the bracket 81, and a connecting hole 82d to which a connecting member 83 is connected. In detail, the bracket 81 has two support walls 82 and a connecting member 83 (see Fig. 5) that connects the two support walls 82, and the attachment hole 82a and the bearing shaft support portion 82b are formed in each of the two support walls 82.

[0057] The two support walls 82 are each formed in a plate shape, and are arranged such that the thickness direction of the plate is the longitudinal direction Y in a state in which the screw tip rotating jig 80 is attached to the end portion 11 of the heating barrel 10. The two support walls 82 are also arranged apart from each other in the longitudinal direction Y in a state in which the screw tip rotating jig 80 is attached to the end portion 11 of the heating barrel 10.

[0058] The connecting member 83 (see FIG. 5) is a rod-shaped member and is disposed between the support walls 82 in the direction in which the two support walls 82 are separated from each other, i.e., in the direction extending in the longitudinal direction Y. The connecting member 83 is connected at both ends to the respective support walls 82 by nuts 83a (see FIG. 5). That is, each support wall 82 is formed with a connecting hole 82d to which the connecting member 83 is connected, and the connecting member 83 is connected to the support wall 82 by being fixed with the nut 83a in a state in which the vicinity of its end is inserted into the connecting hole 82d of the support wall 82. In this way, the two support walls 82 are connected to each other via the connecting member 83.

[0059] In the first embodiment, four connecting members 83 are provided, and the connecting holes 82d are formed in the four corners of the support wall 82. Therefore, the four connecting members 83 are connected to the four corners of each support wall 82, and two support walls 82 are connected by the four connecting members 83.

[0060] The mounting holes 82a of the bracket 81 thus formed are formed at two locations spaced apart in the width direction X when viewed in the longitudinal direction Y, i.e., the axis AX of the screw 20, in a state in which the screw tip rotating jig 80 is attached to the end 11 of the heating barrel 10. The two mounting holes 82a are disposed on both sides of the axis AX of the screw 20 in the width direction X. In addition, the two mounting holes 82a are each formed by an elongated hole. The two mounting holes 82a are formed by, for example, an elongated hole extending in a downward direction as it moves away from the other mounting hole 82a in the width direction X.

[0061] The bracket 81 has two support walls 82, and two mounting holes 82a are formed in each of the support walls 82. The mounting holes 82a of each of the support walls 82 are formed at the same position and with the same shape in the width direction X and the up-down direction Z in a state where they are attached to the end portion 11 of the heating barrel 10. For this reason, when the bracket 81 is viewed in the longitudinal direction Y, the mounting holes 82a formed in two places in each of the two support walls 82 are formed at the same position and with the same shape.

[0062] Similarly to the mounting hole 82a, the bearing shaft support portion 82b is formed at two locations spaced apart in the width direction X when viewed in the longitudinal direction Y, i.e., the axis AX of the screw 20, in a state in which the screw tip rotating jig 80 is attached to the end portion 11 of the heating barrel 10. The two bearing shaft support portions 82b are disposed on both sides of the axis AX of the screw 20 in the width direction X. The two bearing shaft support portions 82b are formed at the upper end of the support wall 82 in the vertical direction Z, and each is formed in the shape of a semicircular notch. The bearing shaft support portion 82b can support the bearing shaft 87 by inserting the bearing shaft 87 into the inside of the semicircular notch.

[0063] The bracket 81 has two support walls 82, and the two bearing shaft support portions 82b are formed in each support wall 82, similar to the two mounting holes 82a. The bearing shaft support portions 82b of each support wall 82 are formed in the same position and shape in the width direction X and the up-down direction Z in a state where they are attached to the end portion 11 of the heating barrel 10. For this reason, when the bracket 81 is viewed in the longitudinal direction Y, the bearing shaft support portions 82b formed in two places on each of the two support walls 82 are formed in the same position and shape.

[0064] The screw tip rotating jig 80 has two bearing shafts 87, and the two bearing shafts 87 are supported by two bearing shaft support portions 82b. That is, the two bearing shafts 87 are supported near both ends by the bearing shaft support portion 82b formed on one of the two support walls 82 and the bearing shaft support portion 82b formed on the other support wall 82.

[0065] The two bearing shafts 87 supported by the bearing shaft support portions 82b at two locations each rotatably support a plurality of bearings 88, and in the first embodiment, each rotatably supports two bearing shafts 87.

[0066] In addition, the two bearing shaft support portions 82b supporting the two bearing shafts 87 are disposed on both sides of the axis center AX of the screw 20 in the width direction X, so the two bearing shafts 87 are also disposed on both sides of the axis center AX of the screw 20 in the width direction X. Therefore, the multiple bearings 88 supported by the two bearing shafts 87 are also disposed on both sides of the axis center AX of the screw 20 in the width direction X.

[0067] Therefore, the multiple bearings 88 supported by the two bearing shafts 87 are arranged below the axis center AX of the screw 20 and on both sides of the axis center AX of the screw 20 in the width direction X when the screw tip rotating jig 80 is attached to the end portion 11 of the heating barrel 10. In the first embodiment, one bearing shaft 87 supports two bearings 88, so two bearings 88 are arranged on each side of the axis center AX of the screw 20 in the width direction X.

[0068] The relief portion 82c is formed across the position of the axis AX of the screw 20 in the width direction X in a state where the screw tip rotating jig 80 is attached to the end 11 of the heating barrel 10. The relief portion 82c is formed in a notch shape at the upper end of the support wall 82 in the up-down direction Z, and for example, the relief portion 82c is formed in a substantially rectangular notch shape. The relief portion 82c is also formed in each of the two support walls 82, similar to the mounting hole 82a and the bearing shaft support portion 82b. The relief portions 82c of each support wall 82 are formed in the same position and shape in the width direction X and the up-down direction Z in a state where the screw tip rotating jig 80 is attached to the end 11 of the heating barrel 10.

[0069] Fig. 8 is a perspective view of a spanner 200 used to attach and detach the screw tip 26. The screw tip 26 is attached to and detached from the screw 20 using a tool for attaching and detaching the screw tip 26. As a tool for attaching and detaching the screw tip 26, for example, a spanner 200 as shown in Fig. 8 is used.

[0070] The wrench 200 has an engagement hole 201 that engages with the outer peripheral surface of the screw tip 26, and a handle 202 that is a part for inputting a force in a rotational direction about the engagement hole 201 to the wrench 200. The engagement hole 201 is a hole of a size and shape that allows it to engage with the outer peripheral surface of the tip 28 of the screw tip 26 from the outside of the tip 28. The handle 202 is formed to extend in a predetermined direction from the position where the engagement hole 201 is formed, and is a part for an operator who performs the work of attaching and detaching the screw tip 26 to the screw 20 to input a force for attachment and detachment.

[0071] <Function of the screw tip rotating jig 80> In the first embodiment, when attaching or detaching the screw tip 26 to the screw 20, a screw tip rotating jig 80 is attached to the end 11 of the heating barrel 10. The screw tip rotating jig 80 is attached to the end 11 of the heating barrel 10 by a mounting bolt 86 at a position below the axis AX of the screw 20, with the side of the bracket 81 on which the bearing shaft 87 is arranged facing upward.

[0072] The screw tip rotation jig 80 is attached to the end 11 of the heating barrel 10 using the screw hole 12 used to attach an end cap 13 (see FIG. 3) to the heating barrel 10. That is, the screw tip rotation jig 80 is attached to the heating barrel 10 by passing a mounting bolt 86 through a mounting hole 82a formed in the bracket 81 and screwing the mounting bolt 86 into the screw hole 12 of the end 11 of the heating barrel 10.

[0073] At that time, since the mounting hole 82a of the bracket 81 is formed as an elongated hole, the position of the bracket 81 relative to the screw hole 12 of the end portion 11 of the heating barrel 10 is adjusted so that the bearing 88 supported by the bearing shaft 87 contacts the screw tip 26. More specifically, the screw tip rotating jig 80 is attached to the heating barrel 10 by adjusting its position relative to the screw hole 12 of the heating barrel 10 so that the bearing 88 contacts the ring 24 arranged on the screw tip 26.

[0074] The screw tip rotating jig 80 is attached to the heating barrel 10 after being adjusted to a position where the bearing 88 contacts the ring 24 arranged on the screw tip 26, so that the screw tip 26 is supported from below by the bearing 88 via the ring 24. Once the screw tip 26 is supported from below by the screw tip rotating jig 80, the tip 28 of the screw tip 26 is inserted into the engagement hole 201 of the spanner 200, and the outer peripheral surface of the tip 28 of the screw tip 26 and the inner peripheral surface of the engagement hole 201 are engaged.

[0075] Once the engagement hole 201 of the wrench 200 and the screw tip 26 are engaged, a force in the rotational direction about the axis AX of the screw 20 is applied to the handle 202 of the wrench 200, thereby inputting a force in the rotational direction to the screw tip 26. In other words, since the screw tip 26 is attached to the screw 20 by screwing the threaded portion 27 into the screw hole 23 of the screw 20, a force in the direction that allows attachment when attaching the screw tip 26 to the screw 20 and a force in the direction that allows removal when removing the screw tip 26 are input to the screw tip 26 via the wrench 200.

[0076] In this case, a part of the key arranged on the screw 20 is engaged with a key groove formed in the rotating member 31, so that the hydraulic motor 35 is connected to the screw 20 via the rotating member 31. Therefore, even if a force in the rotational direction is input to the screw tip 26, the screw 20 is maintained in a stopped state by the resistance of the hydraulic motor 35. Therefore, when a force in the rotational direction is input to the screw tip 26, the screw tip 26 can be rotated relative to the screw 20.

[0077] Since the injection molding machine 1 in which the screw tip rotating jig 80 according to the first embodiment is used is a relatively large injection molding machine 1, the force with which the threaded portion 27 of the screw tip 26 is screwed into the screw hole 23 of the screw 20 is also relatively large. For this reason, when attaching or detaching the screw tip 26 to or from the screw 20 while rotating the screw tip 26 using the wrench 200, a large rotational force is applied to the screw tip 26 by striking the handle 202 of the wrench 200 as necessary.

[0078] At that time, the screw tip 26 is supported by the screw tip rotating jig 80 by the bearing 88 of the screw tip rotating jig 80 contacting the ring 24 arranged on the screw tip 26. That is, the screw tip 26 is rotatably supported by the bearing 88 by the bearing 88 of the screw tip rotating jig 80 contacting the ring 24 from the underside.

[0079] Therefore, when rotating the screw tip 26 with the spanner 200 in order to attach or detach the relatively large and heavy screw tip 26 to or from the screw 20, the work can be performed while the screw tip 26 is supported by the screw tip rotating jig 80. This makes it easy to attach or detach the screw tip 26.

[0080] <Effects of the First Embodiment> The screw tip rotating jig 80 according to the above-mentioned embodiment 1 includes a bracket 81 attached to the heating barrel 10, a bearing shaft 87 disposed on the bracket 81 at a position lower than the axis AX of the screw 20, and a bearing 88 supported by the bearing shaft 87, and the screw tip 26 attached to the screw 20 can be rotatably supported by the bearing 88. As a result, when attaching or detaching the screw tip 26 to or from the screw 20, the work can be performed while supporting the screw tip 26 from below by the bearing 88 of the screw tip rotating jig 80. Therefore, even when performing the work of attaching or detaching the screw tip 26, which is relatively heavy, the work can be performed by concentrating on rotating the screw tip 26 without supporting the screw tip 26 with a large force. As a result, the workability during the work of attaching or detaching the screw tip 26 can be improved.

[0081] Furthermore, since the bearing shafts 87 and the bearings 88 are each disposed in multiple positions below the axis AX of the screw 20, when the screw tip 26 is rotatably supported by the bearings 88, the screw tip 26 can be supported by multiple bearings 88. This makes it possible to more stably support the screw tip 26. As a result, the workability when attaching and detaching the screw tip 26 can be more reliably improved.

[0082] In addition, since the bracket 81 is attached to the heating barrel 10 by the mounting bolt 86 that screws into the screw hole 12 for attaching the end cap 13 to the heating barrel 10, the screw tip rotation jig 80 can be attached to the heating barrel 10 without additional processing of the heating barrel 10. As a result, the workability when attaching and detaching the screw tip 26 can be easily improved.

[0083] In addition, since the mounting hole 82a for the mounting bolt 86 formed in the bracket 81 is formed as an elongated hole, when the screw tip rotating jig 80 is attached to the heating barrel 10, the mounting bolt 86 can be attached while aligning the position of the mounting bolt 86 with the position of the screw hole 12 formed in the end portion 11 of the heating barrel 10. This allows the screw tip rotating jig 80 to be attached to heating barrels 10 of various sizes. In addition, since the mounting hole 82a for the mounting bolt 86 is formed as an elongated hole, when the screw tip rotating jig 80 is attached to the heating barrel 10, the position of the bearing 88 relative to the screw tip 26 can be adjusted while attaching it. This allows the screw tip 26 to be more reliably supported by the bearing 88. As a result, the workability during the attachment and detachment of the screw tip 26 can be more reliably improved.

[0084] [Embodiment 2] The screw tip rotating jig 80 according to the second embodiment has a configuration substantially similar to that of the screw tip rotating jig 80 according to the first embodiment, but is characterized in that it includes an auxiliary support member 90. Since the other configurations are the same as those of the first embodiment, the description thereof will be omitted and the same reference numerals will be used.

[0085] <Screw tip rotation jig 80> 9 is a perspective view showing a state in which the screw tip rotating jig 80 according to the second embodiment is attached to the heating barrel 10. Like the screw tip rotating jig 80 according to the first embodiment, the screw tip rotating jig 80 according to the second embodiment also has a bracket 81, a bearing shaft 87, and a bearing 88, and is attached to the end portion 11 of the heating barrel 10. In addition, in the screw tip rotating jig 80 according to the second embodiment, an auxiliary support member 90 is disposed on the bracket 81.

[0086] The auxiliary support member 90 has a support portion 91, an attachment portion 92, an auxiliary bearing shaft 95, and an auxiliary bearing 96. The support portion 91 is a portion that supports the auxiliary bearing shaft 95, and supports the auxiliary bearing shaft 95 by positioning the auxiliary bearing shaft 95 at a position above the axis AX of the screw 20 when the screw tip rotating jig 80 is attached to the end portion 11 of the heating barrel 10.

[0087] The mounting portion 92 is a portion where the auxiliary support member 90 is attached to the bracket 81. The mounting portion 92 is attached to the bracket 81 near the upper end of the bracket 81, and more specifically, is attached to an upper surface portion 85 (see FIG. 10 ) of the bracket 81, which will be described later. The auxiliary support member 90 is disposed on the upper surface portion 85 of the bracket 81 by attaching the mounting portion 92 to the bracket 81 with a mounting bolt 93. The auxiliary support member 90 is disposed on one side in the width direction X with respect to the axis AX of the screw 20 in a state where the screw tip rotating jig 80 is attached to the end portion 11 of the heating barrel 10.

[0088] The auxiliary bearing shaft 95 is a shaft that passes through the inside of the auxiliary bearing 96 and rotatably supports the auxiliary bearing 96. In detail, the auxiliary bearing shaft 95 is disposed in the auxiliary support member 90 at a position above the axis AX of the screw 20 protruding from the end 11 of the heating barrel 10, and is supported by a support portion 91. In addition, the auxiliary bearing shaft 95 is disposed in the auxiliary support member 90 at a position above the axis AX of the screw 20 in a direction extending along the axis AX of the screw 20 when the screw tip rotating jig 80 is attached to the end 11 of the heating barrel 10. The support portions 91 of the auxiliary support member 90 are disposed near both ends of the auxiliary bearing shaft 95 in the extension direction, and support the vicinity of both ends of the auxiliary bearing shaft 95.

[0089] The auxiliary bearings 96 are rotatably supported by an auxiliary bearing shaft 95 supported by the support portion 91. A plurality of auxiliary bearings 96 are supported by one auxiliary bearing shaft 95, and a plurality of auxiliary bearings 96 are arranged on one auxiliary bearing shaft 95. In the second embodiment, two auxiliary bearings 96 are arranged on one auxiliary bearing shaft 95. The two auxiliary bearings 96 arranged on one auxiliary bearing shaft 95 have the same size.

[0090] Since the auxiliary bearing shaft 95 is positioned above the axis AX of the screw 20 when the screw tip rotation jig 80 is attached to the end 11 of the heating barrel 10, the auxiliary bearing 96 supported by the auxiliary bearing shaft 95 is also positioned above the axis AX of the screw 20.

[0091] Furthermore, the auxiliary bearing 96 is capable of contacting the screw tip 26 attached to the end 22 of the screw 20 or the ring 24 arranged on the screw tip 26 when the screw tip rotating jig 80 is attached to the end 11 of the heating barrel 10. That is, like the bearing 88, the auxiliary bearing 96 is arranged in a range in which its position in the direction along the axis AX of the screw 20, i.e., its position in the longitudinal direction Y, is the same as that of the ring 24 arranged on the screw tip 26.

[0092] For this reason, the auxiliary bearing 96 rotatably supported by the auxiliary bearing shaft 95 rotatably supports the screw tip 26 when it comes into contact with the screw tip 26 or the ring 24 attached to the end 22 of the screw 20. In detail, since the auxiliary bearing 96 is disposed at a position above the axis AX of the screw 20, the auxiliary bearing 96 comes into contact with the screw tip 26 at a position above the axis AX of the screw 20 and rotatably supports the screw tip 26 from above.

[0093] The auxiliary bearing 96 does not have to be in constant contact with the screw tip 26 or the ring 24. The auxiliary bearing 96 may be disposed in a position close to the screw tip 26 or the ring 24, and may be disposed in a position where it comes into contact with the screw tip 26 when the screw tip 26 is displaced during attachment or detachment.

[0094] <Bracket 81> 10 is a perspective view of the bracket 81 shown in FIG. 9. The bracket 81 of the screw tip rotating jig 80 according to the second embodiment has two support walls 82, two side walls 84, and two upper surface portions 85. The two support walls 82 are arranged apart in the longitudinal direction Y as in the first embodiment, and each support wall 82 has a mounting hole 82a, a bearing shaft support portion 82b, and a clearance portion 82c. In the second embodiment, the screw tip rotating jig 80 does not have a connecting member 83 (see FIG. 5), and the two support walls 82 are connected by two side walls 84.

[0095] The two side walls 84 are arranged near both ends of the support wall 82 in the width direction X, with the thickness direction of the plate oriented in the width direction X when the screw tip rotating jig 80 is attached to the end 11 of the heating barrel 10. That is, the two side walls 84 are arranged between the two support walls 82 at positions near both ends of the support wall 82 in the width direction X, and both sides in the longitudinal direction Y are connected to the support wall 82. For this reason, the two support walls 82 are connected to each other via the two side walls 84.

[0096] The upper surface portion 85 is a portion on which the auxiliary support member 90 is disposed when the auxiliary support member 90 is attached to the bracket 81. The two upper surface portions 85 are disposed between the two support walls 82 at positions near the two side walls 84, with the thickness direction of the plate being oriented in the vertical direction Z in a state in which the screw tip rotating jig 80 is attached to the end portion 11 of the heating barrel 10. In detail, the two upper surface portions 85 are disposed corresponding to the two side walls 84, respectively, and each upper surface portion 85 is connected to an upper end portion of the side wall 84 in the vertical direction Z. In addition, the two upper surface portions 85 are disposed on the side where the other upper surface portion 85 is located with respect to the side wall 84 in the width direction X, and the end portion opposite to the side where the other upper surface portion 85 is located in the width direction X is connected to the side wall 84.

[0097] The upper surface portion 85 thus formed has screw holes 85a formed therein for attaching the auxiliary support member 90 to the bracket 81. The auxiliary support member 90 is attached to the bracket 81 by placing the attachment portion 92 of the auxiliary support member 90 on the upper surface portion 85 of the bracket 81, and then screwing an attachment bolt 93 into the screw hole 85a of the upper surface portion 85 with the attachment portion 92 sandwiched therebetween.

[0098] Further, the bracket 81 has upper surface portions 85 disposed on both sides in the width direction X, and the auxiliary support member 90 can be attached to either of the upper surface portions 85. Therefore, the auxiliary support member 90 is attached to the bracket 81 reversibly on one side and the other side of the screw tip 26 in the width direction X.

[0099] <Function of the screw tip rotating jig 80> In the second embodiment as well, when attaching or detaching the screw tip 26 to or from the screw 20, the screw tip rotating jig 80 is attached to the end portion 11 of the heating barrel 10 and the screw tip 26 is supported by a bearing 88.

[0100] In the second embodiment, an auxiliary support member 90 is attached to the bracket 81 of the screw tip rotating jig 80, and the auxiliary support member 90 has an auxiliary bearing 96 that can contact the screw tip 26 from a position above the axis AX of the screw 20. Therefore, when the screw tip 26 is attached or detached using a spanner 200 (see FIG. 8), the screw tip 26 or the ring 24 may come into contact with the auxiliary bearing 96 and is supported by the auxiliary bearing 96 as well.

[0101] As a result, even if the screw tip 26 is shaken and moves upward when the handle 202 of the wrench 200 is struck during attachment or detachment of the screw tip 26, the auxiliary bearing 96 comes into contact with the screw tip 26 and the ring 24, thereby restricting the movement of the screw tip 26. Therefore, when attaching or detaching the screw tip 26 to the screw 20, the screw tip 26 can be prevented from shaking significantly, and the attachment and detachment of the screw tip 26 can be stably performed.

[0102] Here, the screw tip 26 is attached by screwing the threaded portion 27 into the screw hole 23 of the screw 20. For this reason, the direction in which the screw tip 26 is rotated is opposite when attaching the screw tip 26 to the screw 20 and when removing it. As a result, when attaching or removing the screw tip 26, the direction in which the screw tip 26 is deflected by striking the wrench 200 is considered to be different when attaching the screw tip 26 to the screw 20 and when removing it.

[0103] For this reason, when the auxiliary support member 90 is attached to the bracket 81 of the screw tip rotating jig 80, it is attached to the upper surface portion 85 on the side which makes it easier to regulate the wobble of the screw tip 26 when the screw tip 26 is attached to the screw 20 and when it is removed.

[0104] FIG. 11 is an explanatory diagram showing a state in which the auxiliary support member 90 is attached to the bracket 81 on a side different from that shown in FIG. 9. The auxiliary support member 90 is attached to the bracket 81 reversibly on one side and the other side of the screw tip 26 in the width direction X, so that the auxiliary support member 90 is attached to the upper surface portion 85 on the side that is easy to regulate the wobble of the screw tip 26 when the screw tip 26 is attached and when it is removed. That is, as shown in FIG. 9 and FIG. 11, the auxiliary support member 90 is attached to the upper surface portion 85 on the bracket 81 on the side that is suitable for regulating the wobble of the screw tip 26 when the screw tip 26 is attached and when it is removed. As a result, in both cases of attaching the screw tip 26 to the screw 20 and removing the screw tip 26, it is possible to suppress the screw tip 26 from wobbling significantly, and the screw tip 26 can be stably attached and removed.

[0105] <Effects of the second embodiment> In the screw tip rotating jig 80 according to the second embodiment described above, the bracket 81 is provided with an auxiliary support member 90 having an auxiliary bearing 96 that is arranged at a position above the axis AX of the screw 20 and can contact the screw tip 26. Therefore, even if the screw tip 26 is deflected upward by applying a large force to a tool for attachment / detachment such as a wrench 200 during attachment / detachment of the screw tip 26, the movement of the screw tip 26 can be restricted by the auxiliary bearing 96 of the auxiliary support member 90. As a result, even when the attachment / detachment work is performed while applying a large force to the screw tip 26, the work can be performed while suppressing the deflection of the screw tip 26 upward. As a result, the workability during the attachment / detachment work of the screw tip 26 can be improved.

[0106] In addition, since the auxiliary support member 90 is attached to the bracket 81 so as to be replaceable between one side and the other side of the screw tip 26, the auxiliary support member 90 can be attached to the side where the wobble of the screw tip 26 during the attachment and detachment of the screw tip 26 can be easily regulated by the auxiliary bearing 96. Therefore, in both the attachment and detachment of the screw tip 26, the wobble of the screw tip 26 that occurs during each of the operations can be suppressed by the auxiliary bearing 96 of the auxiliary support member 90. As a result, in both the attachment and detachment of the screw tip 26, the wobble of the screw tip 26 can be suppressed when a large force is applied to the screw tip 26. As a result, the workability during the attachment and detachment of the screw tip 26 can be more reliably improved.

[0107] [Variations] In the above-mentioned second embodiment, the screw tip rotating jig 80 changes the position of the auxiliary support member 90 relative to the screw tip 26 by changing the mounting position of the auxiliary support member 90 relative to the bracket 81, but the position of the auxiliary support member 90 relative to the screw tip 26 may be changed by other methods. For example, since the bracket 81 has two support walls 82 formed in the same shape, the position of the auxiliary support member 90 may be appropriately switched between one side and the other side of the screw tip 26 by changing the orientation of the bracket 81 when mounting the screw tip rotating jig 80 to the end portion 11 of the heating barrel 10. In other words, the auxiliary support member 90 may be mounted on the upper surface portion 85 of the bracket 81, and the bracket 81 may be turned over and mounted to the heating barrel 10, thereby appropriately switching the position of the auxiliary support member 90 in the width direction X relative to the screw tip 26.

[0108] As a result, in both the installation and removal of the screw tip 26, the auxiliary bearing 96 of the auxiliary support member 90 can suppress the wobbling of the screw tip 26 when a large force is applied to the screw tip 26. As a result, the workability of the installation and removal of the screw tip 26 can be improved more reliably.

[0109] In addition, in the above-described first and second embodiments, two bearings 88 are arranged on one bearing shaft 87, but the number of bearings 88 arranged on one bearing shaft 87 may be other than two. Similarly, in the above-described second embodiment, two auxiliary bearings 96 are arranged on one auxiliary bearing shaft 95, but the number of auxiliary bearings 96 arranged on one auxiliary bearing shaft 95 may be other than two.

[0110] In the above-described first and second embodiments, the two bearings 88 arranged on one bearing shaft 87 are of the same size, but the multiple bearings 88 arranged on one bearing shaft 87 may be of a size other than the same. Similarly, in the above-described second embodiment, the two auxiliary bearings 96 arranged on one auxiliary bearing shaft 95 are of the same size, but the multiple auxiliary bearings 96 arranged on one auxiliary bearing shaft 95 may be of a size other than the same.

[0111] FIG. 12 is a modified example of the screw tip rotating jig 80 according to the first embodiment, and is an explanatory diagram of a case where a different diameter bearing 88a is arranged on the bearing shaft 87. FIG. 13 is a modified example of the screw tip rotating jig 80 according to the second embodiment, and is an explanatory diagram of a case where a different diameter auxiliary bearing 96a is arranged on the auxiliary bearing shaft 95. In addition to a plurality of bearings 88 of the same size, a different diameter bearing 88a of a different size from the bearings 88 may be arranged on one bearing shaft 87, as shown in, for example, FIG. 12 and FIG. 13. Similarly, in addition to a plurality of auxiliary bearings 96 of the same size, a different diameter auxiliary bearing 96a of a different size from the auxiliary bearings 96 may be arranged on one auxiliary bearing shaft 95, as shown in, for example, FIG. 13.

[0112] 12 and 13 is larger in size, i.e., has a larger outer diameter, than the two bearings 88. Also, the different diameter auxiliary bearing 96a shown in Fig. 13 is larger in size, i.e., has a larger outer diameter, than the two auxiliary bearings 96. The different diameter bearings 88a and the different diameter auxiliary bearings 96a are positioned in the longitudinal direction Y within the range in which the spacer 25 protruding from the heating barrel 10 is positioned, and are capable of contacting the spacer 25.

[0113] That is, since the outer diameter of the spacer 25 is smaller than the outer diameter of the ring 24 disposed on the screw tip 26, the different diameter bearing 88a and the different diameter auxiliary bearing 96a are sized to be able to contact the spacer 25 when the bearing 88 and the auxiliary bearing 96 are in contact with the ring 24. Therefore, when the screw tip 26 is attached to or detached from the screw 20, the different diameter bearing 88a and the different diameter auxiliary bearing 96a can come into contact with the spacer 25, so that the attachment and detachment of the screw tip 26 can be performed more reliably and stably. As a result, the workability during the attachment and detachment of the screw tip 26 can be improved more reliably.

[0114] The auxiliary support member 90 of the second embodiment may be configured to adjust the position of the auxiliary bearing 96 in the vertical direction Z. FIG. 14 is a modified example of the screw tip rotating jig 80 according to the second embodiment, and is an explanatory diagram of the screw tip rotating jig 80 having the auxiliary support member 90 capable of adjusting the position of the auxiliary bearing 96. For example, as shown in FIG. 14, the auxiliary support member 90 may be configured with a support member 100 supporting the auxiliary bearing shaft 95 and a mounting member 105 mounted on the bracket 81 being separate members. In the auxiliary support member 90 shown in FIG. 14, the support member 100 supporting the auxiliary bearing shaft 95 is connected to the mounting member 105 so that the position in the vertical direction Z can be adjusted, thereby making it possible to adjust the position of the auxiliary bearing 96 in the vertical direction Z.

[0115] FIG. 15 is a perspective view of a support member 100 included in the auxiliary support member 90 shown in FIG. 14. The support member 100 has a support portion 101, a side wall 102, and a back surface portion 104. The support portion 101 is a plate-shaped member arranged such that the thickness direction is the longitudinal direction Y, and a support hole 101a is formed through which the auxiliary bearing shaft 95 is passed to support the auxiliary bearing shaft 95. The support portion 101 has two support portions 101 arranged at a distance in the longitudinal direction Y that is shorter than the length of the auxiliary bearing shaft 95. Therefore, the support portion 101 can support the vicinity of both ends of the auxiliary bearing shaft 95 by passing the auxiliary bearing shaft 95 through the support holes 101a of the two support portions 101.

[0116] The side walls 102 are plate-shaped portions extending downward in the up-down direction Z from each of the two support parts 101. Therefore, similar to the support parts 101, the two side walls 102 are arranged spaced apart in the longitudinal direction Y. Each side wall 102 is formed with a mounting hole 103 through which a mounting bolt 110 for connecting the support member 100 and the mounting member 105 passes.

[0117] The back surface portion 104 is a plate-like member disposed between the side walls 102 spaced apart in the longitudinal direction Y, and both ends in the longitudinal direction Y are connected to the two side walls 102. The two support portions 101 and the support portion 101 having the two side walls 102 are integrally formed by the back surface portion 104.

[0118] Fig. 16 is a perspective view of a mounting member 105 of the auxiliary support member 90 shown in Fig. 14. The mounting member 105 has a mounting portion 106, a side wall 107, and a back surface portion 109. The mounting portion 106 is a plate-shaped member arranged with its thickness direction oriented in the up-down direction Z, and serves as a portion for mounting the auxiliary support member 90 to the bracket 81. A mounting hole 106a is formed in the mounting portion 106, through which a mounting bolt 93 (see Fig. 9) for mounting the auxiliary support member 90 to the bracket 81 passes.

[0119] The side walls 107 are used to connect the mounting member 105 and the support member 100. The side walls 107 are plate-shaped members whose thickness direction is the longitudinal direction Y, and are disposed extending upward from the mounting portion 106. There are two side walls 107, similar to the side walls 102 of the support member 100, and the two side walls 107 are disposed spaced apart in the longitudinal direction Y. Each side wall 107 is formed with an elongated hole 108 through which a mounting bolt 110 for connecting the support member 100 and the mounting member 105 passes. The elongated hole 108 is an elongated hole extending in the vertical direction Z.

[0120] The back surface portion 109 is a plate-like member disposed between the side walls 107 spaced apart in the longitudinal direction Y, with both ends in the longitudinal direction Y connected to the two side walls 107 and a lower end connected to the mounting portion 106. The mounting portion 106 and the mounting member 105 having the two side walls 107 are reinforced by the back surface portion 109 and are integrally configured.

[0121] The support member 100 and the mounting member 105 thus configured are connected by a mounting bolt 110 with the side wall 102 of the support member 100 and the side wall 107 of the mounting member 105 overlapping each other. That is, the support member 100 and the mounting member 105 are connected by the mounting bolt 110, with the mounting bolt 110 being passed through a mounting hole 103 formed in the side wall 102 of the support member 100 and an elongated hole 108 formed in the side wall 107 of the mounting member 105. At that time, since the hole for the mounting bolt 110 formed in the side wall 107 of the mounting member 105 is the elongated hole 108 extending in the vertical direction Z, the mounting bolt 110 can move its position relative to the mounting member 105 in the vertical direction Z.

[0122] For this reason, when connecting the support member 100 and the mounting member 105, the support member 100 can be moved in the vertical direction Z together with the mounting bolt 110, and the position of the support member 100 in the vertical direction Z relative to the mounting member 105 can be adjusted. Therefore, the position of the auxiliary bearing 96 arranged on the auxiliary bearing shaft 95 supported by the support member 100 in the vertical direction Z relative to the mounting member 105 can be adjusted, and the position of the auxiliary bearing 96 in the vertical direction Z relative to the bracket 81 can be adjusted.

[0123] This allows the position of the auxiliary bearing 96 in the vertical direction Z to be adjusted according to the size of the screw tip 26 and the ring 24, so that the auxiliary bearing 96 can be brought into appropriate contact with the screw tip 26 and the ring 24 from above the axis AX of the screw 20, regardless of the size of the screw tip 26 and the ring 24. As a result, regardless of the size of the screw tip 26 and the ring 24, it is possible to suppress upward shaking of the screw tip 26 when performing attachment / detachment work while applying a large force to the screw tip 26, and the workability during attachment / detachment work of the screw tip 26 can be improved.

[0124] In the above-mentioned first and second embodiments, the screw tip rotating jig 80 is used for attaching and detaching the screw tip 26 of the injection device 5 of the so-called hydraulic injection molding machine 1, but the injection molding machine 1 in which the screw tip rotating jig 80 is used may be an electric type. Regardless of the power source of the injection molding machine 1, the screw tip rotating jig 80 can be used as a jig for attaching and detaching the screw tip 26 of the injection device 5, thereby improving the workability during the attachment and detachment of the screw tip 26. [Explanation of symbols]

[0125] 1... injection molding machine, 5... injection device, 10... heating barrel, 11... end, 12... screw hole, 13... end cap, 14... nozzle, 15... mounting bolt, 16... hopper, 20... screw, 21... flight, 22... end, 23... screw hole, 24... ring, 24a... protrusion, 25... spacer, 26... screw tip, 27... threaded portion, 28... tip portion, 28a... groove portion, 30... bearing unit, 31... rotating member, 32... holder, 33... roller Dial bearing, 34... thrust bearing, 35... hydraulic motor, 40... hydraulic cylinder, 41... piston, 42... piston rod, 45... return side chamber, 46... injection side chamber, 50... two-position changeover valve, 51... three-position changeover valve, 52... solenoid, 53... solenoid, 54... two-position changeover valve, 55... hydraulic pump, 56... tank, 60... mold clamping device, 61... fixed platen, 62... movable platen, 65... mold, 65a... cavity, 66... ​​fixed metal Die, 67...movable die, 80...screw tip rotating jig, 81...bracket, 82...support wall, 82a...mounting hole, 82b...bearing shaft support portion, 82c...relief portion, 82d...connecting hole, 83...connecting member, 83a...nut, 84...side wall, 85...upper surface portion, 85a...screw hole, 86...mounting bolt, 87...bearing shaft, 88...bearing, 88a...different diameter bearing, 90...auxiliary support member, 91...support portion, 92...mounting portion, 93... Mounting bolt, 95... auxiliary bearing shaft, 96... auxiliary bearing, 96a... different diameter auxiliary bearing, 100... support member, 101... support portion, 101a... support hole, 102... side wall, 103... mounting hole, 104... rear portion, 105... mounting member, 106... mounting portion, 106a... mounting hole, 107... side wall, 108... long hole, 109... rear portion, 110... mounting bolt, 200... spanner, 201... engagement hole, 202... handle, AX... shaft center

Claims

1. a bracket attached to an end of the heating barrel; A bearing shaft is disposed on the bracket at a position below an axis of a screw protruding from the end of the heating barrel and extends in a direction along the axis of the screw; A bearing that is supported by the bearing shaft and rotatably supports a screw tip attached to an end of the screw; A screw tip rotating jig comprising:

2. The screw tip rotating jig according to claim 1 , wherein the bearing shaft and the bearing are each arranged in a plurality of positions below the axis of the screw.

3. 2. The screw tip rotation tool according to claim 1, wherein the bracket is attached to the end of the heated barrel by a mounting bolt that threads into a threaded hole for mounting an end cap to the end of the heated barrel.

4. The bracket has a mounting hole through which the mounting bolt passes, The screw tip rotating jig according to claim 3, wherein the mounting hole is formed as an elongated hole.

5. The bracket includes: An auxiliary bearing shaft that is disposed above the axis of the screw and extends in a direction along the axis of the screw; An auxiliary bearing supported by the auxiliary bearing shaft and arranged so as to be in contact with the screw tip; The screw tip rotating jig according to claim 1, further comprising an auxiliary support member having a

6. The screw tip rotating jig according to claim 5, wherein the auxiliary support member is removably attached to one side and the other side of the bracket across the screw tip.

7. The screw tip rotation jig described in claim 5, wherein the position of the auxiliary support member can be switched between one side and the other side of the screw tip by changing the orientation of the bracket when attached to the end of the heating barrel.

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